- Use a relative path for GIMP_LOGO_PATH inside the gi-docgen generated
HTML, and not an absolute path taken from build dir (otherwise this
would break, for installed docs, but also for the tarball and the
developer website!).
- Also use either gimp-logo.png or gimp-devel-logo.png depending on
whether we are on a stable or unstable branch.
- Install these in images/ inside the GIMP docs folder, which
corresponds to the relative path given to GIMP_LOGO_PATH.
- The installed root dir will be $datadir/doc/gimp-2.99/, e.g.
/usr/share/doc/gimp-2.99/
- Inside this folder, the library references will be in libgimp-3.0/ and
libgimpui-3.0/ (instead of weird Gimp-3.0/ and GimpUi-3.0/). Note that
the root dir uses the application version (2.99) whereas the library
folder use the API versions. These are different in development phase.
- Archive the gi-docgen installed files, not taken from the build dir,
to avoid packaging temp files, such as the .toml files. Note that
`g-ir-docs` files are still taken from the build dir, as we don't
install them yet.
- Finally package all this in a directory before archiving in a tar.xz,
named the same as the directory (e.g. gimp-api-docs-2.99.13/ inside
gimp-api-docs-2.99.13.tar.xz).
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